Description
Product Detail
Slip on flanges are ring-type flanges with a bore slightly larger than the pipe outside diameter, allowing the flange to slip over the pipe before internal and external fillet welding. They are a cost-effective choice for low to medium pressure piping systems and are commonly used in process piping, utilities, cooling water, fire protection, shipbuilding and general industrial service. Their easy alignment and economical installation make them popular for fabricated piping assemblies.
SASA FLANGE supplies slip on flanges in carbon steel, stainless steel, alloy steel and duplex stainless steel with customized dimensions, drilling patterns and facing options. Each order can be supported by chemical analysis, mechanical testing, dimensional inspection, PMI testing, hardness testing where required, EN 10204 3.1 certificate and full heat number traceability to ensure compliance with project and international standard requirements.
- ✓Product Name: Slip On Flanges
- ✓Material Grade: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
- ✓Product Type: Pipe Flange, Slip-On Type
- ✓Main Feature: Easy pipe alignment, economical installation, reliable fillet welded connection
- ✓Applications: Oil and gas, chemical processing, power plants, water treatment, marine piping, HVAC and fire protection systems
Product Parameters
| Product Name | Slip On Flanges |
| Material Grade | ASTM A105/A105N, A350 LF2, A694 F52/F60/F65, A182 F304/F304L, F316/F316L, F321, F347, F11, F22, F91, F51, F53, F55 |
| Material Type | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel, Super Duplex Stainless Steel |
| Product Form | Forged flange, plate flange, machined flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN6 – PN100 / JIS 5K – 40K |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Anti-rust oil, painted, hot-dip galvanized, pickling, passivation, machined finish |
| Standard | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
The following chemical composition is for general reference based on a common carbon steel slip on flange grade. Actual composition depends on the selected material grade, heat treatment condition and applicable standard. Final values shall comply with the relevant ASTM, EN, DIN, JIS or GB specification and the issued mill test certificate.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A105 max / typical % | 0.35 max | 0.10-0.35 | 0.60-1.05 | 0.035 max | 0.040 max | 0.30 max | 0.40 max | 0.12 max | Cu 0.40 max, V 0.08 max, Nb 0.02 max |
Mechanical Properties
Mechanical properties shown below are representative values for commonly supplied slip on flange materials. Actual tensile strength, yield strength, elongation and hardness can vary by grade, product form, heat treatment condition and section thickness. Project requirements and final inspection reports should always refer to the applicable material standard and certified test results.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| ASTM A105 | 485 MPa min | 250 MPa min | 22% min | 187 HB max | 7.85 g/cm3 |
| ASTM A182 F316/F316L | 515 MPa min | 205 MPa min | 30% min | 217 HB max | 7.98 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | A105, F304/F316 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | A105, LF2, F304/F316, F11/F22 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | A105, LF2, F11/F22, F51 | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | A105, F304/F316 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Raised Face Slip On Flange | Standard slip on flange with raised gasket seating face for most industrial bolted joints | Oil and gas, chemical, utility piping |
| Flat Face Slip On Flange | Flat sealing surface designed for use with full-face gaskets and mating flat face equipment flanges | Water treatment, low-pressure cast iron valve connections |
| RTJ Slip On Flange | Slip on flange with ring type joint groove for metallic ring gasket sealing in higher pressure service | Refining, offshore, high-pressure hydrocarbon lines |
| Large Diameter Slip On Flange | Fabricated or forged slip on flange produced to larger pipeline sizes under ASME B16.47 or project drawing | Cooling water, marine, tank farm and transmission systems |
Equivalent Standards and International Names
Slip on flanges are produced according to different international dimensional standards and are available in equivalent carbon steel and stainless steel grades for global projects. The exact dimensions, pressure ratings and drilling patterns differ by region, so standard and material equivalency should always be confirmed during quotation and order review.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A105, A350 LF2, A182 F304/F316 |
| Europe | EN 1092-1 | P245GH, C22.8, 1.4301, 1.4401 |
| Germany | DIN 2527 / 2566 | C22.8, P250GH, 1.4301, 1.4571 |
| Japan | JIS B2220 | SFVC2A, SUS304, SUS316 |
| China | GB/T 9119 | 20#, 16Mn, 06Cr19Ni10, 06Cr17Ni12Mo2 |
Production Process Flow
SASA FLANGE controls each manufacturing stage of slip on flanges from raw material verification to final packing. Process control ensures dimensional accuracy, correct bore size, sealing face quality and traceable material performance for industrial piping applications.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified forging billets or plates | Material certificate and traceability |
| Forging | Hot forging to achieve required shape | Forging temperature and reduction ratio |
| Heat Treatment | Normalizing, tempering or annealing | Temperature and holding time control |
| Machining | Sealing face, bolt holes, dimensions | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is performed to verify the selected flange material meets the specified standard such as ASTM A105, A182 F316 or other project grades. Spectrometer or laboratory analysis checks key alloying elements and impurity limits. This confirms the material is suitable for the required pressure, temperature and corrosion conditions before shipment.
2. Mechanical Properties Testing
Mechanical testing confirms that the flange material achieves the required tensile strength, yield strength, elongation and hardness in accordance with applicable standards. Testing is performed on representative samples from the same heat or batch after heat treatment. The results provide assurance of structural reliability during welding, bolting and long-term service in industrial piping systems.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, bore size, flange thickness, bolt circle, bolt hole diameter, number of holes, hub dimensions where applicable and facing details such as RF height or RTJ groove profile. Accurate inspection ensures full compliance with ASME, EN, DIN, JIS or GB standards and proper fit-up with mating flanges, valves and piping components.
4. PMI Testing and Hydrostatic Testing
Positive Material Identification is available to confirm alloy grade using XRF or equivalent methods, especially for stainless steel, alloy steel and duplex flanges. Hydrostatic pressure testing can be arranged according to project requirements for assembled systems or special applications. SASA FLANGE also provides EN 10204 3.1 certificate, inspection records and full heat number traceability for each shipment.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
Slip on flanges are used in a wide range of industrial piping systems where economical installation, convenient alignment and dependable flanged joints are required. They are especially suitable for low to medium pressure service, utility lines and general process applications across energy, chemical, marine and infrastructure projects.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Process lines, produced water systems, utility piping, tank terminal piping | Provides economical flanged connections with easy alignment and reliable welding for non-critical and medium-pressure services |
| Chemical Processing | Chemical transfer lines, cooling water, solvent service, general process piping | Available in stainless and alloy grades for corrosion resistance and standardized maintenance-friendly joints |
| Power Generation | Boiler auxiliary systems, cooling circuits, compressed air and service water lines | Offers cost-effective installation and broad compatibility with standard piping specifications |
| Water Treatment | Raw water, filtered water, dosing lines, pump and valve connections | Flat face or raised face options suit low-pressure systems and frequent maintenance requirements |
| Marine and Offshore | Ballast lines, seawater systems, fire lines, platform utility piping | Easy fabrication and availability in galvanized, stainless and duplex materials support demanding marine environments |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Slip-On Flanges for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is a slip on flange?
A: A slip on flange is a pipe flange with a bore slightly larger than the pipe outside diameter, allowing it to slide over the pipe before welding. It is normally fillet welded on the outside and inside for strength. This design makes alignment easier and reduces machining cost, making it a popular choice for general industrial piping systems.
Q: What materials are available for slip on flanges?
A: SASA FLANGE supplies slip on flanges in carbon steel, low-temperature carbon steel, stainless steel, alloy steel, duplex and super duplex grades. Common materials include ASTM A105, A350 LF2, A182 F304/F304L, F316/F316L, F11, F22, F91, F51 and F53. Special materials can also be produced according to project specifications and drawings.
Q: What pressure class is supported?
A: Slip on flanges are available in ASME Class 150, 300, 400, 600, 900, 1500 and 2500, as well as EN PN6 to PN100 and JIS 5K to 40K depending on size and standard. The actual available range depends on material, dimensions and service conditions. SASA FLANGE can recommend the appropriate rating based on your operating pressure and temperature.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can manufacture custom slip on flanges according to customer drawings or project requirements, including non-standard OD, ID, thickness, bolt hole drilling, facing type and special material grades. We also support RTJ grooves, flat face machining, special coatings and large-diameter fabrication to suit OEM, EPC and maintenance applications.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate together with standard MTC documentation for supplied slip on flanges. Additional quality documents can include PMI test reports, dimensional inspection records, hardness or mechanical test reports and hydrostatic test reports when required. Full heat number traceability is maintained from raw material through finished product shipment.
Contact Us
If you are looking for slip on flanges or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
